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Reconciliation of Basic and Diluted Shares - Reconciliation of Basic and Diluted Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Earnings Per Share [Abstract] |  |  |  |
Income (loss) from continuing operations attributable to Enviri Corporation common stockholders | $ (11,995) | $ (9,663) | $ (41,556) | $ (28,539)
Weighted-average shares outstanding - basic (in shares) | 80,165 | 79,850 | 80,085 | 79,767
Dilutive effect of stock-based compensation (in shares) | 0 | 0 | 0 | 0
Weighted-average shares outstanding - diluted (in shares) | 80,165 | 79,850 | 80,085 | 79,767
Earnings (loss) from continuing operations per common share, attributable to Enviri Corporation common stockholders: |  |  |  |
Basic (in dollars per share) | $ (0.15) | $ (0.12) | $ (0.52) | $ (0.36)
Diluted (in dollars per share) | $ (0.15) | $ (0.12) | $ (0.52) | $ (0.36)

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